The effect of side-channel sediment source on downstream fining trend of Haram- Abad River watershed )western Malayer plain(

Khodabakhsh, S. Khodabakhsh; Karimi, M.; Rafiei, B.; Rashnoo, H.; Sahraro, N.

The effect of side-channel sediment source on downstream fining trend of Haram- Abad River watershed )western Malayer plain(

Authors

S. Khodabakhsh Khodabakhsh

M. Karimi

B. Rafiei

H. Rashnoo

N. Sahraro

Abstract

Haram- Abad river basin (area = 2965 Km²) is an elongated basin located in south ofHamedan Province and occurs in the Sanandaj- Sirjan structural zone. 1392 km² of this region is located in the westernMalayer plain. Five lithofaceis were recognized in the river sediments: Gms, Gm, Sh, Sl and Fm and Fr. The river sediments are very poorly sorted, positively skewed and platykurtic.Four discontinuities were recognized in in the downstream decrease in the gravel percent. They occur as a result of the entrance of side-channel sediment sources (i.e. alluvial fan, tributaries and colluviums) to the main-river channel. Increase in the gravel percent is less significant (3-8%) in those tributaries with lower slope and slate and schist lithology than the tributaries with higher slope and granite and limestone lithology (25-32%). This shows the provenance lithology is also important in the downstream fining trend of the studied river.

Keywords

facies

fining trend

Haram Abad River

Malayer